Mean BMI [kg/m2]
Study	Outcome	Surgery	No surgery	P value
Dixon 2008	BMI at 2 years, mean	29.5	36.6
Dixon 2008
Dixon 2008
Dixon 2012	BMI at 2 years, mean	36.6	42.3
Dixon 2012
Dixon 2012
Ikramuddin 2013	BMI at 12 months, mean (SD)	25.8 (3.5)	31.6 (3.7)	Difference ‐5.5 (95% CI ‐6.8 to ‐4.2)
Ikramuddin 2013
Ikramuddin 2013
Liang 2013	BMI at 12 months. mean (SD): LRYGB v no surgery	24.51 (0.91)	30.38 (1.66)	P < 0.01
Liang 2013	BMI at 12 months, mean (SD): LRYGB v no surgery + exenatide	24.51 (0.91)	26.84 (1.21)	P < 0.05
Liang 2013
Mingrone 2012	BMI at 2 years, mean (SD)	29.31 (2.64)	43.07 (6.44)	P < 0.001
Mingrone 2012
Mingrone 2012
O'Brien 2006	BMI at 12 months (mean (95% CI)	27.0 (26.2 to 27.8)	29.9 (29.1 to 30.8)	P < 0.001
O'Brien 2006	BMI at 18 months (mean (95% CI)	26.7 (25.9 to 27.5)	30.9 (30.0 to 31.8)	P < 0.001
O'Brien 2006	BMI at 24 months (mean (95% CI)	26.4 (25.6 to 27.2)	31.5 (30.6 to 32.4)	P < 0.001
Schauer 2012	BMI at 12 months, mean (SD): LYRGB	26.8 (3.2)	34.4 (3.7)	P < 0.001
Schauer 2012	BMI at 12 months, mean (SD): LSG	27.2 (3.5)	34.4 (3.7)	P < 0.001
Schauer 2012